Die head



J1me 1927", H. T. SHEARER DIE HEAD 2 Sheets-Sheet 1 Filed Nov. 11. 1924 i: 4 gwve'ni'ol Harry TShe'arer 6110: neg,

June H. 'r. SHEARER DIE HEAD Filed Nov. 11, 192 ZShQQtS-Sheet 2 Kass-1- 7 g V W Y's/10am? Patented June 7, 1927.

f UNITED STATES ATENT OFFICE.

HARRY ,T. snnnnnn, or

wAxNEsBono, PENNSYLVANIA, nssIGNon "ro L ANDIs MA, I

-, CHINE oomreNY, or w YNnsBoRqrnNNsY vANIe, A conronA'noN or PE N- SYLVAN'IA.

DIE HEAD.

'Application filed November '11 1924. Serial No. 749,222.

My said invention relates to' a die head intended primarily for use with automatic machines for cutting screw threads on pipes,

rods and the like. Inthe case of such automatic machines the camsforclosing the heads must be made or adjusted very accurately to insure properclosing action and where this is not done the locking elements of the die heads are often broken off or dam aged. With the improved die head of my said invention such accurate positioning of the 'closing'cams is not necessary thus 1n-' creasing the life of thehead and requiring less supervision. The same considerations apply to hand machines where the head is closed otherwise than by direct manual actuation; i. e, by mechanical orpoweroper'atedme'ans i Referring to the accompanying drawings,

, which are made apart hereof and on which similar'reference characters indicate similar p s Figure 1 is a side elevationof an overtravel' die head adapted to cut right-hand:

threads only,

Figure 2, a fragmentary longitudinal sec- 'tionof the same.

. Figurev3, an end elevation,

Figure 4,. a side elevation of a die head for cutting either right-hand or left-hand threads,

Figure 5, a fragmentary longitudinal section of the same, and v Figure 6, an end elevation thereof.

In Figures 1 to 3 of the drawings reference character 10 indicates a. shank of conventional character on which the die head is supported. The die head is generally similar to that shown in applications 580,- 210, Augu t 7, 1922, and 581,160, August 11, 1922, by Samuel- F. Newman and James G. "Harper consisting, of a seriesof rings 11, 12, 13 and 14 providing a ring frame surrounding the head body (not shown). ring -14is adapted to .be moved by a handle 15 in a-direction to move the cutter-carrying blocks with their trunn'ions 16 and thus bring the cutter-s17, which are of the well known long-life Landis type. of adjustable tangential thread-cutters, into engagement with the work indicated at 18, it being understood thatfche cutter carrying blocks The front are pivoted-to the ring 14 at 19 as in the apglications above referred to. 7

spring 20bears at one end against a pin 21 fixed to the ring. 14 for moving it in a direction to open the head and at the other end rests in -'a socket in a screw plug 22' which screw plug serves to adjust the ten sion of the spring. f

A series of pins 23 are mounted for move- 26 after which both bushings may be forci bly removed as explained. in application 581,160, above referred to. The reduced end 24 of each pin 23 fits closely in its hardened ment in a direction parallel to the axis of the bushing 25' and the ring 14 must be accurate.

ly positioned relatively to the ring 13 and other parts of the head if the pin 23 is to move directly into-alinement with the bore of the bushing. Because of variations in .the position of the cams for closing the heads it is sometimes difficult or impossible.

in automatic and power-actuated machines to, secure such accurate registration of the pin and the bore and therefore I have provided a recess at 27 cut back from the recess in which the bushing 25 is located and have also cut away the bushing at one side.

' The effect of the above change is that the closing cams onan automatic machine vcan be set so that they force the ring 14 further in a counter-clockwise direction (Fig. 3) than is necessary for bringing the pins 23 into registration with the bores of their respective bushings 25. v The ends 24 of the pins are then free toslide into the depres sions 27 and when the ring 14 is released by. its closing cam the spring 20 immediately forces it into the positionfillustrated in Figure 2, when the chasers 17 will be in correct position for operation.

In Figures rings 11,- 12 and 13 are as h-ereinbefore de- SCIlbGL' The ring 14, however, is modified 4, 5 and 6 the shank and the sides as indicated at 30 to permit the pins'23 to assume their locking position on over-. 10

travel of the ring 14:.

A spring 31 is forced against a pin 32 as .in the form above described for biasing the closing ring to move in a direction toward closing position. The spring has one end extending into a'socket in a screw 33which' screw engages threads in the ring 13. This ring is provided with a tlireadedplng 34 for closing a corresponding opening leading to the pin 32 from the opposite side and when the direction of operation of the cutter head is to be changed the positions of the threaded plugs 33 and 34 may beexclianged,

the spring 31 being moved with the plug33' whereby it biases the ring 14 toward a closing'position the-opposite to that illustratedin the drawings p I have illustrated and described a form v of the invention which is the oneatpreseut preferred but it .will be obvious to 'fthose i skilled in the art that numerous. changes may be made in my device and therefore I do not limit 'myself towhatis shown in the drawings and described in the specifi cation but onlyas indicated in the appended claims, it being conceivable that the relative rotation of'parts might be reversed, the po sition and fol-moi: the locking .detents might be altered, and manyiotlier changes might be made. ,Having thus fully'described my said invention, what I claim as new and desire to secure "by Letters Patentv is: 1. A. die, headcomprising a ring mounted co axially with the head and adapted to '1 I closing the head, one or more pins movable oscillate relativelyithereto for opening and.

"jflengthwisefof the headffrom position back withsaid holding it in head-closineans p rmitting; the pins g nos ti" in", and";

V .to advance toward such position even after the ring-isrotated position, substantial y past its normal lockin I as set forth, 2., A. die head comprising means movable in a path concentric with the axis of the head for opening and closing the head, a spring ,for moving said means in one direction, one or more pins movable lengthwise of the head from a position out of engagement with said means intoa position for holding said means in head-closing; position,

and meanspermitting said pins to assume locking position in an over-travel position of. said means past suchhead-closing position,

substantially as set'forth. 1

i thefriiig into engagement 3. A; die head comprising tangential thread cutting chasers, a ring at the front,

that side to the depth of said shallow 'recesses, substantially as set forth.

- 4. A die head comprising meansmovable either clockwise or counter-clockwise for locking thelicad closed to cut right-hand and left-hand threads respectively, means for locking the ring in head closing positioii, and resilient means to-return said movable means to predetermined position after anover-travel of the same in either direction,-substantially as set forth.

. 5. A die. head comprising means movable either clockwise or counter-clockwise for locking the head closed to cut right-hand and left-hand threads respectively, means for locking the ring. in head closing position, means to return said movable means to predetermined position after an over-travel of thesame in either direction, and means permitting said locking means to move toward locking position on such over-travel, substantially as set forth.

- -.6." A die lieadcomprising means movable :either clockwise or counter-clockwise for locking the headclosed. to cut right-hand adaptablc'to return the'head to a predetermined position after an oi'rer-travel of the movable means .in either direction, substantially as set forth.

7. A die head comprising means movable either clockwise or counter-clockwise, .for

locking the head closed to out right-hand and left-hand threads respectively, means for locking said movable means in headclosing position including one or more pins movable lengthwise of thehead to engage recesses in said movable means, means adaptable to return the head to a predetermined position after an over-travel of the movable means in either direction, and means permitting the locking means to move toward locking position on such over-travel, substantially as set forth.

8.. A thread-cutting die head comprising tangential chasers, a ring movable either clockwise or counter-clockwise about the head for locking the head closed to cut right-hand and left-hand threads respectively, one or more pins movably mounted and left-hand threads respectively, means for locking said .movable means in head- 9. A 'e head comprising a ring adapted to move clockwise'or counter-clockwise about the head for closing the head to cut righthand or left-hand respectively, a ring held in fixed relation to said axis, one or more locking pins on one of said rings, andtwin recesses on the other ring for each of said pins whereb the head may be locked in either of sai closed positions, substantially as set forth. 10. A die head comprising tangential thread-cutting chasers, means movable either clockwise or counter-clockwise for locking thehead closed to cut right-hand and left-handthreads respectively, means for locking the ring in head-closing position including a lpair of apertures in the ring adjacent eac pin adapted to receive the ins to lock the head in right-hand or leftand cutting position respectively, and means permitting, over-travel of the ring about the head in its movement toward zithtlalr closed position, substantially as set ort 3 11. A cutter head comprising a closing 4 r1110 adapted for cooperation with righthand and lefbhand cutters to lock the head in closed relation, one or more pins movable longitudinally of the head, a pair of 1-" recesses on the ring adjacent each pin, and

bushin in saidrecesses said'bushmgs being r need in height at their adjacent sides to permit over-travel of the ring about the head in its movement toward either closed position, substantially as set forth.

12. A die head comprising 'chasers, supporting means therefor, means relatively rotatable to right-or left about the head for closing the head to cut to right or left ,45 hand respectively, means to lock the head closed in either position including one or more detents won one of said relatively ro- "tatable vmembers, said detents being movable lengthwise of the head, and twin recesses in the other movable member for each one of said detents, forth.

13. A die head comprising chasers,.supportingbmeans therefor, means relatively rotatable to right or left about the head substantially as set for closingcthehead to cut to right or left hand respectively, means to lock the head closed in either position including one or more detents on one of said relatively rotatable members, twin recesses in the other for each dctcnt, and means permitting said detents to advance on over-travel of said relatively rotatable members, substantially as set forth.

14. A die hcadcomprising chasers with their bodies extending tangentially to the work, supporting 'means for said chasers, a ring rotatable relatively to the head for moving the chasers into and out of closed position, blunt-ended pins on one of the relatively rotatable parts adapted to engage or disengage recesses in the other for locking the head in closed position when engaged, and means permitting the locking means to advance on over-travel of the relatively r0 tatable parts when disengaged, substantiallyas set forth.

15. A die head comprising elongated chasers having serrations on a long face tangential to the work, a control j-member arranged to oscillate, about the axis of the. head in a plane substantially at right an- 'les to said axis, means on the controlmemher whereby the same may vbeoscillated relatively ,to the head, and locking means movable axially relatively to the control member from a position out' of engagement with said control member to a position of engagement therewith on overtravel of said control member, substantially as set forth. In witness whereof, vI have hereunto set 'my hand at Waynesboro, l ennsylvania this HARRY T. SHEARER.

'seventee'nth day of October, A. D. nineteen. hundred and twenty-four. 

